docs: def get_hvcs() -> Base:
      """Get HVCS helper class
  
      :raises ImproperConfigurationError: if the hvcs option provided is not valid
      """
      hvcs = config.get('semantic_release', 'hvcs')
      debug('get_hvcs: hvcs=', hvcs)
      try:
          return globals()[hvcs.capitalize()]
      except KeyError:
          raise ImproperConfigurationError('"{0}" is not a valid option for hvcs.')